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Big Round Top
Big Round Top is a boulder-strewn hill notable as the topographic high point of the Gettysburg Battlefield and for 1863 American Civil War engagements for which Medals of Honor were awarded. In addition to battle monuments, a historic postbellum structure on the uninhabited hill is the Big Round Top Observation Tower Foundation Ruin. Geography Big Round Top is the southern peak of the Gettysburg Battlefield and is within the area encompassed by a drainage depression (southeast, south), Plum Run (west, north), and the Crawford Avenue/Wright Avenue roadway (north, northeast). In addition to Little Round Top, adjacent battlefield locations arSouth Cavalry Field (west), (northwest) and the [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Round Top (other)
Round Top is an extinct volcano in the Berkeley Hills, just east of Oakland, California. Round Top or Roundtop may also refer to: Communities * Kirkwood, California, formerly Roundtop, a census-designated place * Round Top, Pennsylvania, a community adjacent to the Gettysburg National Military Park * Round Top, Texas, a town * Roundtop, West Virginia, a former unincorporated community Other places * Round Top Island (Tasmania), Australia ** Round Top Island National Park * Round Top (Alpine County, California), the highest peak in the Mokelumne Wilderness * Round Top (Delaware County, New York) * Roundtop (Franklin, Delaware County, New York) * Roundtop (Roxbury, Delaware County, New York) * Roundtop Mountain (Greene County, New York) * Round Top (Herkimer County, New York) * Round Top (Livingston Manor, New York) * Round Top (New York), an elevation in Otsego County, New York * Roundtop Mountain (Ulster County, New York) * Ski Roundtop The Roundtop Mountain Resort is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Devil's Den
Devil's Den is a boulder-strewn hill on the south end of Houck's Ridge at Gettysburg Battlefield, used by artillery and sharpshooters on the second day of the 1863 Battle of Gettysburg during the American Civil War. A tourist attraction since the memorial association era, several boulders are worn from foot traffic and the site includes numerous cannon, memorials, and walkways, including a bridge spanning two boulders. History Devil's Den was formed with Little Round Top (to the east-northeast) and Big Round Top (southwest) by periglacial frost wedging of the igneous landform formed 200 million years ago when a diabase sill intruded through the Triassic Gettysburg plain. The feature acquired its foreboding name prior to the 1863 battle. Throughout the mid-19th century, local residents believed that the crevices between the boulders were home to a large snake. The size of the reptile varied between accounts, but reports ranged from to as large as . The snake became known ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Outcrop
An outcrop or rocky outcrop is a visible exposure of bedrock or ancient superficial deposits on the surface of the Earth. Features Outcrops do not cover the majority of the Earth's land surface because in most places the bedrock or superficial deposits are covered by soil and vegetation and cannot be seen or examined closely. However, in places where the overlying cover is removed through erosion or tectonic uplift, the rock may be exposed, or ''crop out''. Such exposure will happen most frequently in areas where erosion is rapid and exceeds the weathering rate such as on steep hillsides, mountain ridges and tops, river banks, and tectonically active areas. In Finland, glacial erosion during the last glacial maximum (ca. 11000 BC), followed by scouring by sea waves, followed by isostatic uplift has produced many smooth coastal and littoral outcrops. Bedrock and superficial deposits may also be exposed at the Earth's surface due to human excavations such as quarrying and build ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Culp's Hill
Culp's Hill,. The modern U.S. Geographic Names System refers to "Culps Hill". which is about south of the center of Gettysburg, Pennsylvania, played a prominent role in the Battle of Gettysburg. It consists of two rounded peaks, separated by a narrow saddle. Its heavily wooded higher peak is above sea level. The lower peak is about 100 feet (30 m) shorter than its companion. The eastern slope descends to Rock Creek, about 160 feet (50 m) lower in elevation, and the western slope is to a saddle with Stevens Knoll (formerly McKnight's Hill) with a summit lower than the main Culp's Hill summit. The hill was owned in 1863 by farmer Henry Culp and was publicized as "Culp's Hill" by October 31, 1865. During the Battle of Gettysburg, July 1–3, 1863, Culp's Hill was a critical part of the Union Army defensive line, the principal feature of the right flank, or "barbed" portion of what is described as the "fish-hook" line. Holding the hill was by itself unimportant because its h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Newark Supergroup
The Newark Supergroup, also known as the Newark Group, is an assemblage of Upper Triassic and Lower Jurassic sedimentary rocks which outcrop intermittently along the United States East Coast. They were deposited in a series of Triassic basins approximately 190 million years ago as North America separated from Africa. The exposures extend from Nova Scotia to North Carolina. Related basins are also found underwater in the Bay of Fundy. The group is named for the city of Newark, New Jersey. Characteristics The Newark Supergroup consists largely of poorly sorted nonmarine sediments; typical rocks are breccia, conglomerate, arkose sandstone, siltstone, and shale. Most of the strata are red beds that feature ripple marks, mud cracks, and even rain drop prints; dinosaur footprints are common, though actual body fossils are very rare. Some of the strata are detailed to the level of varves, with indications of Milankovitch cycles. In preserved lake sediments, ''Semionotus'' fossils are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Triassic–Jurassic Extinction Event
The Triassic–Jurassic (Tr-J) extinction event, often called the end-Triassic extinction, marks the boundary between the Triassic and Jurassic periods, , and is one of the top five major extinction events of the Phanerozoic eon, profoundly affecting life on land and in the oceans. In the seas, the entire Class (biology), class of conodonts and 23–34% of marine genus, genera disappeared. On land, all Archosauromorpha, archosauromorphs other than Crocodylomorpha, crocodylomorphs, pterosaurs, and dinosaurs became extinct; some of the groups which died out were previously abundant, such as aetosaurs, phytosaurs, and Rauisuchidae, rauisuchids. Some remaining non-mammalian therapsids and many of the large Temnospondyli, temnospondyl amphibians had become extinct prior to the Jurassic as well. However, there is still much uncertainty regarding a connection between the Tr-J boundary and terrestrial vertebrates, due to a lack of terrestrial fossils from the Rhaetian (latest) stage of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Igneous
Igneous rock (derived from the Latin word ''ignis'' meaning fire), or magmatic rock, is one of the three main rock types, the others being sedimentary and metamorphic. Igneous rock is formed through the cooling and solidification of magma or lava. The magma can be derived from partial melts of existing rocks in either a planet's mantle or crust. Typically, the melting is caused by one or more of three processes: an increase in temperature, a decrease in pressure, or a change in composition. Solidification into rock occurs either below the surface as intrusive rocks or on the surface as extrusive rocks. Igneous rock may form with crystallization to form granular, crystalline rocks, or without crystallization to form natural glasses. Igneous rocks occur in a wide range of geological settings: shields, platforms, orogens, basins, large igneous provinces, extended crust and oceanic crust. Geological significance Igneous and metamorphic rocks make up 90–95% of the top ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carr Hill
Carr Hill is a suburb in the Metropolitan Borough of Gateshead in Tyne and Wear, England. It is bordered by Felling to the north, Sheriff Hill to the south, Windy Nook to the east and Deckham to the west. It lies south of Gateshead, south of the city of Newcastle upon Tyne and north of the historic City of Durham. Once a village in County Durham, it was incorporated into the Metropolitan Borough of Gateshead by the Local Government Act 1972 on 1 April 1974. One of the less populous of the former villages that comprise the metropolitan borough, Carr Hill has a long history and was first developed by the Romans. During the Industrial Revolution it became the centre of pottery making in Tyneside, and numerous stone quarries, glass makers and windmills were set up. It also had a large reservoir providing water to several areas of Gateshead and Newcastle upon Tyne. Industrial decline from the turn of the 20th century, coupled with the building of Gateshead's first council estat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
North-northwest
The points of the compass are a set of horizontal, radially arrayed compass directions (or azimuths) used in navigation and cartography. A compass rose is primarily composed of four cardinal directions—north, east, south, and west—each separated by 90 degrees, and secondarily divided by four ordinal (intercardinal) directions—northeast, southeast, southwest, and northwest—each located halfway between two cardinal directions. Some disciplines such as meteorology and navigation further divide the compass with additional azimuths. Within European tradition, a fully defined compass has 32 'points' (and any finer subdivisions are described in fractions of points). Compass points are valuable in that they allow a user to refer to a specific azimuth in a colloquial fashion, without having to compute or remember degrees. Designations The names of the compass point directions follow these rules: 8-wind compass rose * The four cardinal directions are north (N), east (E), s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seminary Ridge
Seminary Ridge is a dendritic ridge which was an area of Battle of Gettysburg engagements in July 1863 during the American Civil War (1861–1865), and of military installations during World War II (1941–1945). Geography Seminary Ridge is a northern portion of the drainage divide between the Marsh Creek Watershed on the west and the Rock Creek Watershed (east). At the south end of Oak Ridge (the northernmost portion of the divide), the north-south McPherson and Seminary ridges bifurcate southward at the triple watershed point of Willoughby's and Pitzer runs (southward tributaries of Marsh Creek) with a Rock Creek eastward tributary. From the triple point, Seminary Ridge extends southward to an area with eastward drainage into the Rock Cr tributary ( Stevens Creek), with the borough of Gettysburg, and with the TBD. Farther south into the Gettysburg National Park, Seminary Ridge continues as far as a branch of Pitzer Run, which divides the ridgeline (), around which th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gettys-Black Divide
The Gettys-Black divide is the primary drainage divide of Cumberland Township, Adams County, Pennsylvania; extending from the mouth of Stevens Creek (Rock Creek), Stevens Creek southward past Samuel Gettys' 1761 tavern ~7 miles to the mouth of Plum Run (Rock Creek), Plum Run at the dam site for Rock Creek (Monocacy River), Robert Black's 1798 Mill. From a Gettysburg, Pennsylvania, ridge within the Gettysburg borough, the divide extends southward across several Battle of Gettysburg, strategic features of the Gettysburg Battlefield: *Cemetery Hill (503 ft) *Cemetery Ridge, including the triple point for Plum R/Stevens Cr (west) & Rock Cr (east)Weikert Hill*Little Round Top *Big Round Top The divide descends the east slope of Big Round Top and passes north of a drainage, then extends south-southeast across farm fields near the PA 134, Taneytown Road to Rock Creek (Monocacy River), Rock Creek at the unincorporated community of Template:Adams County, Pennsylvania, Barlow, Pennsylvan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ridge
A ridge or a mountain ridge is a geographical feature consisting of a chain of mountains or hills that form a continuous elevated crest for an extended distance. The sides of the ridge slope away from the narrow top on either side. The lines along the crest formed by the highest points, with the terrain dropping down on either side, are called the ridgelines. Ridges are usually termed hills or mountains as well, depending on size. Smaller ridges, especially those leaving a larger ridge, are often referred to as spurs. Types There are several main types of ridges: ;Dendritic ridge: In typical dissected plateau terrain, the stream drainage valleys will leave intervening ridges. These are by far the most common ridges. These ridges usually represent slightly more erosion resistant rock, but not always – they often remain because there were more joints where the valleys formed or other chance occurrences. This type of ridge is generally somewhat random in orientation, often ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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